CN112071492A - Flexible fireproof cable and fireproof mud filler used for same - Google Patents
Flexible fireproof cable and fireproof mud filler used for same Download PDFInfo
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- CN112071492A CN112071492A CN202011041663.XA CN202011041663A CN112071492A CN 112071492 A CN112071492 A CN 112071492A CN 202011041663 A CN202011041663 A CN 202011041663A CN 112071492 A CN112071492 A CN 112071492A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
Abstract
The invention discloses a flexible fireproof cable and fireproof mud filler used for the flexible fireproof cable. The fireproof cable comprises a cable core, wherein the outer portion of the cable core is coated with a flexible fireproof mud packing layer, a polyester tape winding layer, a flame-retardant glass fiber tape winding layer and a sheath layer from inside to outside. The invention has excellent fire resistance and good flexibility, is convenient for flexible operation in the laying construction process of finished cables, and is beneficial to greatly prolonging the laying construction period.
Description
Technical Field
The invention relates to a cable, in particular to a flexible fireproof cable and fireproof mud filler for the fireproof cable.
Background
The fireproof cable is widely applied to various buildings and industrial and mining environments due to excellent fire resistance. Common fireproof cables include a rigid fireproof cable and a flexible fireproof cable. The flexible fireproof cable has the technical advantages of low price, unlimited section length, convenience in laying and the like, and occupies a large market share.
The common flexible fireproof cable mainly comprises a cable core, fireproof mud filler filled outside the cable core or in a twisted gap, a glass fiber tape wrapping layer wrapping the fireproof mud filler, and a sheath layer extruded outside the glass fiber tape wrapping layer. Although it has good fire resistance, it has the following main technical problems:
1. the flexibility of the fireproof mud filler is poor (the flexible shelf life of the fireproof mud filler is about half a month generally), the fireproof mud filler cannot keep flexible for a long time and is easy to dry and harden, so that the finished cable is laid before the fireproof mud filler becomes dry and hardened, otherwise, the fireproof mud filler in the fireproof cable is subjected to brittle cracking caused by bending and other operations in the laying process, the fireproof performance of the fireproof cable is directly influenced, and the technical requirement of the fireproof performance preset by the fireproof cable cannot be met;
the high technical requirement on the laying period is obviously not beneficial to the flexible development of the laying operation, once the laying period is forced to be prolonged due to special conditions, the fireproof cables with the unqualified fireproof performance are installed, or the fireproof cables with the unqualified fireproof performance are scrapped;
in addition, the high technical requirement on the laying time limit cannot form large-batch reserve production for cable production enterprises;
2. although the glass fiber tape wrapping structure wrapped outside the fireproof mud filler has a good flame retardant effect, the porous structure of the glass fiber tape wrapping structure easily enables the fireproof mud filler to seep outwards in the cable forming process, so that the subsequent extrusion process of the sheath layer is directly influenced to be carried out smoothly, and the technical difficulty of cable forming is increased; on the other hand, the drying and hardening of the fire-proof mud filler (caused by the air permeability of the porous structure) can be accelerated to a certain extent, and the subsequent laying period of the finished cable is directly influenced.
Disclosure of Invention
The technical purpose of the invention is as follows: aiming at the defects of the prior art, the flexible fireproof cable which is good in flexibility, not easy to dry and harden and convenient to form is provided, and the fireproof mud filler for the fireproof cable is also provided.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a flexible fireproof cable, includes the cable core, the outside from interior to the outer cladding of cable core has flexible fire prevention mud packing layer, polyester area around covering, fire-retardant glass fiber tape around covering and restrictive coating. The technical measure has excellent fire resistance, and the flexible fireproof mud packing layer can keep flexible for a long time (more than half a year after being tested), has good flexibility and is not easy to dry and harden, so that flexible operation in the finished cable laying construction process is facilitated, and the laying construction period is greatly prolonged; because the polyester tape is wound on the covering layer and has good non-hygroscopicity and air tightness, the polyester tape is arranged close to the flexible fireproof mud packing layer in the cable forming process, the flexible fireproof mud packing layer is well fixed, and the moisture in the flexible fireproof mud is reliably prevented from dissipating, so that the flexible fireproof mud packing is effectively prevented from leaking outwards, the ventilation and drying of the flexible fireproof mud packing are effectively controlled, the forming technical difficulty of the cable is effectively reduced, the forming is convenient, the flexibility of the finished cable is maintained for a long time, and the full roundness of the finished cable is good; the flame-retardant glass fiber tape wrapping layer has a good high-temperature-resistant effect, so that the fire resistance of the cable is effectively enhanced, the drying progress of the wrapped flexible fireproof mud filler is effectively delayed in cooperation with the polyester tape wrapping layer, and the flexibility of the finished cable is favorably kept for a long time.
As one of the preferable schemes, a metal armor layer is arranged between the wrapping layer and the sheath layer of the flame-retardant glass fiber tape. Further, the metal armor layer is a wrapping structure of a galvanized steel belt, a non-magnetic stainless steel belt, an aluminum belt or an aluminum alloy belt. The technical measure effectively improves the structural strength of the cable, ensures the safety and stability of the cable in laying construction and later service processes, and can form good mechanical protection effect on the coated flexible fireproof mud filler in the processes of a fire-resistant and knocking vibration test and a fire-resistant and spraying test by matching with the structure of the flexible fireproof mud filler layer through a simple fire-resistant test, a fire-resistant and knocking vibration test and a fire-resistant and spraying test specified in British Standard BS:6387 and BS:8491, thereby effectively preventing the mechanical damage of knocking vibration on the flexible fireproof mud filler and the spray of water splash on the flexible fireproof mud filler, reliably ensuring the crust integrity of the flexible fireproof mud filler in the flame combustion process and preventing the flame from further damaging the coated insulating layer structure.
As one of the preferred schemes, the cable core of the fireproof cable is of a single-insulated conductor structure, the insulated conductor mainly comprises a conductor, an insulating tape wrapping layer and an insulating material extruding layer, the insulating tape wrapping layer and the insulating material extruding layer are sequentially coated outside the conductor, a plurality of convex ribs protruding outwards are distributed on the periphery of the insulating material extruding layer, and the convex ribs are embedded into the flexible fireproof mud filler layer. Furthermore, the insulating tape wrapping layer is of a mica tape wrapping structure wrapping more than two layers. And all the convex edges distributed on the periphery of the insulating material extruding layer are molded along the length direction of the insulating material extruding layer. Aiming at a single insulated conductor, the technical measure ensures that the single insulated conductor and an external flexible fireproof mud filler layer form reliable mutual embedding combination through the convex ribs distributed on the periphery of the insulating material extrusion layer, particularly the convex ribs formed along the length direction of the insulating material extrusion layer so as to enhance the flexibility and the structural strength of a finished cable; in addition, the insulating layer structure that the insulated conductor adopted can make high temperature resistant, the good insulating mica tape of insulating nature form good fire resistance's main insulating function in the conductor outside, can make the crowded covering of insulating material that insulating nature is good cooperate the insulating tape to wrap the covering, both reach and tighten, whole circle function, reliably strengthen insulating properties again, and the insulating properties under the two cooperations is excellent.
Or, as another optional scheme, the cable core of the fireproof cable is a twisted structure of a plurality of insulated conductors, each insulated conductor mainly comprises a conductor, an insulated tape wrapping layer and an insulated material extruding layer, the insulated tape wrapping layer and the insulated material extruding layer are sequentially wrapped outside the conductor, an inner twisted gap formed by twisting the insulated conductors is filled with a flame-retardant filling layer, and an outer twisted groove is filled with a flexible fireproof mud filling layer. Furthermore, the insulating tape wrapping layer is of a mica tape wrapping structure wrapping more than two layers. Aiming at the multi-insulated conductors, the technical measures ensure that the insulated conductors and an external flexible fireproof mud filler layer form reliable mutual embedded combination through a stranded structure of the multi-insulated conductors so as to enhance the flexibility and the structural strength of a finished cable; in addition, the insulating layer structure that each insulated conductor adopted can make high temperature resistant, the good mica tape of insulating nature form good fire resistance's main insulating function in the conductor outside, can make the crowded covering of insulating material that insulating nature is good cooperate the insulating tape to wrap the covering, both reach and tighten, whole circle function, reliably strengthen insulating properties again, and the insulating properties under the two cooperations is excellent.
The fireproof mud filler for the flexible fireproof cable is prepared from the following raw materials in parts by weight: 55-65 parts of magnesium hydroxide, 30-40 parts of sodium silicate, 1-10 parts of methyl silicone oil and 1-10 parts of lignocellulose. The technical measure ensures that the four environment-friendly and nontoxic raw material components are mutually compatible and cooperated to form the flexible fireproof mud filler; the fireproof mud filler takes magnesium hydroxide and sodium silicate as basic raw materials of mineral fireproof mud, and has excellent fireproof performance; the methyl silicone oil with excellent heat resistance, electrical insulation and weather resistance is used as an anti-sticking and lubricating agent, which is beneficial to improving the integral insulation, heat resistance and weather resistance of the fireproof mud filler, and the anti-sticking and lubricating properties of the anti-sticking and lubricating agent can reliably reduce the sticking property of the fireproof mud filler, so that when the fireproof mud filler is extruded in the cable forming process, the machine head blockage condition of an extruder is effectively improved, the cable forming process is favorably carried out smoothly, and the service life of the machine head of the extruder is favorably prolonged; the lignocellulose which has excellent flexibility and dispersibility and high temperature resistance is used as a flexibility increasing agent, and after the flexibility increasing agent is mixed with other three raw materials, the components of the raw materials can be more uniformly dispersed, a three-dimensional net structure is formed, the strength and the stability of the molecular structure of the whole fireproof mud filler are obviously enhanced, the flexibility is excellent, and the drying and hardening progress of the whole fireproof mud filler is greatly delayed.
The beneficial technical effects of the invention are detailed in the comments on each technical measure.
The finished cables (six cable structures without metal armor layers and six cable structures with metal armor layers) of the invention and the fire-proof cables (six cables) with fire-proof mud filler in the market are subjected to the following flexibility test and fire-proof grade test.
Test conditions of the flexibility test: placing the cables in the same space under a normal temperature environment, and observing the property change of the internal fireproof mud filler; after the placing time is finished, a bending test is carried out;
the test result of the flexibility test shows that: after a common fireproof cable in the market is placed for 15 days, fireproof mud filler in the cable becomes dry and hard, and cracks and other defects begin to appear after the cable is bent by 20 times of the outer diameter of the cable; after the cable is placed for 190 days, the fireproof mud filler in the cable is not dried and hardened and still keeps flexible, and the bending radius of the cable can reach 11 times of the outer diameter of the cable through a bending test; it can be seen that the flexibility performance of the present invention is significant;
test conditions for fire resistance rating test: based on each cable of the flexibility test, a simple fire resistance test, a fire resistance and knocking vibration test and a fire resistance and spraying test are carried out according to the regulations in British BS (base station) 6387 standard and BS 8491 standard, the flame temperature of the test is 900 ℃, and the combustion time is 180 min;
the test results of the fire resistance rating test show that:
the cable structures (two) without the metal armor layer and the cable structures (two) with the metal armor layer can both meet the fire resistance grade requirement of a simple fire resistance test; common fireproof cables (two cables) in the market can also meet the fire resistance grade requirement of a simple fire resistance test;
the two cable structures without metal armor layers of the invention can not meet the fire-resistant grade requirement of the fire-resistant and knocking vibration test; the two cable structures with the metal armor layers can meet the fire-resistant grade requirement of a fire-resistant and knocking vibration test; the fire-resistant grade requirements of the fire-resistant and knocking vibration tests cannot be met by common fire-resistant cables (two cables) in the market; thus, the fire resistance of the invention is remarkable;
the two cable structures without metal armor layers of the invention can not meet the fire-resistant grade requirement of fire-resistant and spraying tests; the two cable structures with the metal armor layers can meet the fire-resistant grade requirement of a fire-resistant and spraying test; the fire-resistant grade requirements of fire-resistant and spraying tests cannot be met by common fire-resistant cables (two cables) in the market; it can be seen that the fire resistance of the present invention is significant.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is another schematic structure of the present invention.
The reference numbers in the figures mean: 1-a conductor; 2, insulating tape wrapping; 3-extruding and coating the insulating material; 4-fireproof mud packing layer; 5-polyester tape-wound cladding; 6, wrapping a flame-retardant glass fiber tape; 7-metal armor layer; 8, a sheath layer; 9-ribs; 10-flame retardant filling layer.
Detailed Description
The invention relates to a cable, in particular to a flexible fireproof cable and fireproof mud filler for the fireproof cable, and the main technical content of the invention is explained in detail by using a plurality of embodiments. In the embodiment 1, the technical scheme content of the invention is clearly and specifically explained in conjunction with the attached drawings of the specification, namely, fig. 1; embodiment 2, the technical solution content of the present invention is clearly and specifically explained in conjunction with the attached drawings of the specification, that is, fig. 2; in other embodiments, although not separately depicted, the main structure of the embodiment can still refer to the drawings of embodiment 1.
It is expressly noted here that the drawings of the present invention are schematic and have been simplified in unnecessary detail for the purpose of clarity and to avoid obscuring the technical solutions that the present invention contributes to the prior art.
Example 1
Referring to fig. 1, the cable comprises a cable core, and a flexible fireproof mud packing layer 4, a polyester tape wrapping layer 5, a flame-retardant glass fiber tape wrapping layer 6, a metal armor layer 7 and a sheath layer 8 which are sequentially wrapped outside the cable core from inside to outside.
The cable core is of a single insulated conductor structure and is composed of a conductor 1, an insulating tape wrapping layer 2 and an insulating material extruding layer 3, wherein the insulating tape wrapping layer 2 and the insulating material extruding layer 3 are sequentially wrapped outside the conductor 1. The conductor 1 is formed by twisting a plurality of copper wires. The insulating tape wrapping layer 2 is a mica tape wrapping structure with two wrapping layers (three or four layers are also possible, and two or three layers are usually enough). Crowded covering 3 of insulating material is cross-linked polyethylene and extrudes the structure, there are many (be more than three usually) outside bellied bead 9 in the basic evenly distributed in the periphery of crowded covering 3 of insulating material (shaping in the lump when crowded covering 3 of insulating material is extruded, this embodiment is six) every bead 9 along the crowded covering 3's of insulating material length direction shaping, the root of every bead 9 is the smooth transition of fillet form with the crowded covering 3's of insulating material periphery, the protruding height of these bead 9 makes the crowded covering 3 periphery of insulating material between the adjacent bead 9 form indent space.
The flexible fireproof mud packing layer 4 is formed by fully mixing the following raw materials in parts by weight at normal temperature and then extruding: 60 parts of magnesium hydroxide, 35 parts of sodium silicate, 3 parts of methyl silicone oil and 2 parts of lignocellulose. The crowded package of flexible fire prevention mud packing layer 4 is in insulated conductor's outside, wraps up insulated conductor's periphery is whole to make these beads 9 on the crowded package of insulating material 3 imbed respectively in flexible fire prevention mud packing layer 4, flexible fire prevention mud packing layer 4 surpasss the thickness of bead 9 and is one time of the protruding height of bead 9 at least.
The polyester tape wrapping layer 5 is arranged close to the flexible fireproof mud packing layer 4, the wrapping overlapping rate is not lower than 25%, and the polyester tape wrapping layer has good fixing and waterproof dispersion effects on the flexible fireproof mud packing layer 4.
The flame-retardant glass fiber tape wrapping layer 6 is a wrapping structure of a low-smoke halogen-free flame-retardant glass fiber tape and is arranged close to the polyester tape wrapping layer 5.
The metal armor layer 7 is a wrapping structure of a galvanized steel strip. Of course, the galvanized steel strip may be replaced with a non-magnetic stainless steel strip, an aluminum strip, or an aluminum alloy strip.
The sheath layer 8 is an extrusion structure of low-smoke halogen-free polyolefin sheath material.
Example 2
Referring to fig. 2, the cable comprises a cable core, and a flexible fireproof mud packing layer 4, a polyester tape wrapping layer 5, a flame-retardant glass fiber tape wrapping layer 6, a metal armor layer 7 and a sheath layer 8 which are sequentially wrapped outside the cable core from inside to outside.
The cable core is a twisted structure of a plurality of (in this embodiment, four) insulated conductors, an internal twisted gap (i.e., a space surrounded by twisted insulated conductors) formed by twisting the insulated conductors is filled with a flame-retardant filling layer 10, and the flame-retardant filling layer 10 is a linear high-temperature-resistant flame-retardant material. Each insulated conductor consists of a conductor 1, an insulated tape wrapping layer 2 and an insulated material extruding layer 3, wherein the insulated tape wrapping layer 2 and the insulated material extruding layer 3 are sequentially wrapped outside the conductor 1; the conductor 1 is formed by twisting a plurality of copper wires; the insulating tape wrapping layer 2 is a mica tape wrapping structure with two layers (or three or four layers, usually two or three layers are enough) of wrapping; the insulating material extrusion coating layer 3 is a cross-linked polyethylene extrusion structure.
The flexible fireproof mud packing layer 4 is formed by fully mixing the following raw materials in parts by weight at normal temperature and then extruding: 55 parts of magnesium hydroxide, 37 parts of sodium silicate, 5 parts of methyl silicone oil and 3 parts of lignocellulose. The flexible fireproof mud packing layer 4 is extruded outside the stranded structures of the insulated conductors, the peripheries of the stranded structures of the insulated conductors are completely wrapped, so that external stranded grooves formed by stranding the insulated conductors (namely, outer side grooves between adjacent insulated conductors) are filled, a certain reasonable wrapping thickness is formed outside the stranded structures of the insulated conductors, and the whole flexible fireproof mud packing layer 4 and the insulated conductors of a plurality of stranded structures are combined in an embedded mode.
The polyester tape wrapping layer 5 is arranged close to the flexible fireproof mud packing layer 4, the wrapping overlapping rate is not lower than 25%, and the polyester tape wrapping layer has good fixing and waterproof dispersion effects on the flexible fireproof mud packing layer 4.
The flame-retardant glass fiber tape wrapping layer 6 is a wrapping structure of a low-smoke halogen-free flame-retardant glass fiber tape and is arranged close to the polyester tape wrapping layer 5.
The metal armor layer 7 is a wrapping structure of a galvanized steel strip. Of course, the galvanized steel strip may be replaced with a non-magnetic stainless steel strip, an aluminum strip, or an aluminum alloy strip.
The sheath layer 8 is an extrusion structure of low-smoke halogen-free polyolefin sheath material.
Example 3
The fireproof cable comprises a cable core, a flexible fireproof mud packing layer, a polyester tape wrapping layer, a flame-retardant glass fiber tape wrapping layer and a sheath layer, wherein the flexible fireproof mud packing layer, the polyester tape wrapping layer, the flame-retardant glass fiber tape wrapping layer and the sheath layer are sequentially wrapped outside the cable core from inside to outside.
The cable core is of a single insulated conductor structure and is composed of a conductor, an insulating tape wrapping layer and an insulating material extruding layer, wherein the insulating tape wrapping layer and the insulating material extruding layer are sequentially wrapped outside the conductor. The conductor is a solid copper conductor. The insulating tape wrapping layer is a mica tape wrapping structure with two wrapping layers (three or four layers can be adopted, and two or three layers are enough generally). The crowded covering of insulating material is crosslinked polyethylene and extrudes the structure, the basic evenly distributed in the periphery of the crowded covering of insulating material has (the crowded covering of insulating material is formed in the lump when extrusion moulding) many (be more than three usually, this embodiment is six) outside bellied bead, every bead is along the crowded length direction shaping of covering of insulating material, the root of every bead is the smooth transition of fillet form with the crowded covering's of insulating material periphery, the protruding height of these beads makes the crowded covering periphery of insulating material between the adjacent bead form indent space.
The flexible fireproof mud packing layer is formed by fully mixing the following raw materials in parts by weight at normal temperature and then extruding: 58 parts of magnesium hydroxide, 36 parts of sodium silicate, 4 parts of methyl silicone oil and 2 parts of lignocellulose. The crowded package of flexible fire prevention mud packing layer is in insulated conductor's outside, wraps up insulated conductor's periphery is whole to make these beads on the crowded package layer of insulating material imbed in the flexible fire prevention mud packing layer respectively, the thickness that flexible fire prevention mud packing layer surpassed the bead is the one time of bead bellying height at least.
The polyester tape wrapping layer is arranged close to the flexible fireproof mud packing layer, the wrapping overlapping rate is not lower than 25%, and the polyester tape wrapping layer has good fixing and waterproof dispersion functions on the flexible fireproof mud packing layer.
The flame-retardant glass fiber tape wrapping layer is of a wrapping structure of the low-smoke halogen-free flame-retardant glass fiber tape and is arranged close to the polyester tape wrapping layer.
The sheath layer is an extrusion structure of low-smoke halogen-free polyolefin sheath material.
Example 4
The fireproof cable comprises a cable core, a flexible fireproof mud packing layer, a polyester tape wrapping layer, a flame-retardant glass fiber tape wrapping layer and a sheath layer, wherein the flexible fireproof mud packing layer, the polyester tape wrapping layer, the flame-retardant glass fiber tape wrapping layer and the sheath layer are sequentially wrapped outside the cable core from inside to outside.
The cable core is a twisted structure of a plurality of (four in this embodiment) insulated conductors, an internal twisted gap (i.e., a space surrounded by twisted insulated conductors) formed by twisting the insulated conductors is filled with a flame-retardant filling layer, and the flame-retardant filling layer is made of a linear high-temperature-resistant flame-retardant material. Each insulated conductor consists of a conductor, an insulated tape wrapping layer and an insulated material extruding layer, wherein the insulated tape wrapping layer and the insulated material extruding layer are sequentially wrapped outside the conductor; the conductor is formed by twisting a plurality of copper wires; the insulating tape wrapping layer is a mica tape wrapping structure with two layers (three or four layers can be adopted, and two or three layers are enough generally) of wrapping; the insulating material extrusion layer is of a cross-linked polyethylene extrusion structure.
The flexible fireproof mud packing layer is formed by fully mixing the following raw materials in parts by weight at normal temperature and then extruding: 60 parts of magnesium hydroxide, 34 parts of sodium silicate, 4 parts of methyl silicone oil and 2 parts of lignocellulose. The flexible fireproof mud packing layer is extruded outside the stranded structures of the insulated conductors, the peripheries of the stranded structures of the insulated conductors are completely wrapped, so that external stranded grooves formed by stranding the insulated conductors (namely, outer side grooves between adjacent insulated conductors) are filled, certain reasonable coating thickness is formed outside the stranded structures of the insulated conductors, and the whole flexible fireproof mud packing layer and the insulated conductors of a plurality of stranded structures are combined in an embedded mode.
The polyester tape wrapping layer is arranged close to the flexible fireproof mud packing layer, the wrapping overlapping rate is not lower than 25%, and the polyester tape wrapping layer has good fixing and waterproof dispersion functions on the flexible fireproof mud packing layer.
The flame-retardant glass fiber tape wrapping layer is of a wrapping structure of the low-smoke halogen-free flame-retardant glass fiber tape and is arranged close to the polyester tape wrapping layer.
The sheath layer is an extrusion structure of low-smoke halogen-free polyolefin sheath material.
Example 5
The other contents of the embodiment are the same as those of the embodiment 1, except that the flexible fire-proof mud packing layer is formed by fully mixing and extruding the following raw materials in parts by weight at normal temperature: 56 parts of magnesium hydroxide, 30 parts of sodium silicate, 1 part of methyl silicone oil and 1 part of lignocellulose.
Example 6
The other contents of the embodiment are the same as those of the embodiment 2, except that the flexible fire-proof mud packing layer is formed by fully mixing and extruding the following raw materials in parts by weight at normal temperature: 62 parts of magnesium hydroxide, 33 parts of sodium silicate, 7 parts of methyl silicone oil and 5 parts of lignocellulose.
Example 7
The other contents of the embodiment are the same as those of the embodiment 2, except that the flexible fire-proof mud packing layer is formed by fully mixing and extruding the following raw materials in parts by weight at normal temperature: 65 parts of magnesium hydroxide, 40 parts of sodium silicate, 10 parts of methyl silicone oil and 9 parts of lignocellulose.
The above examples are intended to illustrate the invention, but not to limit it. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the above embodiments may still be modified or some of the technical features may be equally replaced (e.g., the ribs on the extruded insulation layer are formed in a spiral shape; e.g., the ribs on the extruded insulation layer are formed in segments); and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.
Claims (9)
1. The utility model provides a flexible fireproof cable, includes the cable core, its characterized in that: the cable core is coated with a flexible fireproof mud packing layer (4), a polyester tape wrapping layer (5), a flame-retardant glass fiber tape wrapping layer (6) and a sheath layer (8) from inside to outside.
2. The flexible fire-resistant cable according to claim 1, wherein: and a metal armor layer (7) is arranged between the flame-retardant glass fiber tape wrapping layer (6) and the sheath layer (8).
3. The flexible fire-resistant cable according to claim 2, wherein: the metal armor layer (7) is a wrapping structure of a galvanized steel strip, a non-magnetic stainless steel strip, an aluminum strip or an aluminum alloy strip.
4. A flexible fire-resistant cable according to claim 1 or 2, characterized in that: the cable core of fireproof cable is single insulated conductor structure, insulated conductor mainly by conductor (1) and cladding in proper order the outside insulating tape of conductor (1) is around covering (2) and insulating material crowded covering (3) are constituteed, the periphery of insulating material crowded covering (3) distributes and has many outside bellied bead (9), in these bead (9) embedding flexible fire prevention mud packing layer (4).
5. The flexible fire-resistant cable according to claim 4, wherein: the insulating tape wrapping layer (2) is of a mica tape wrapping structure wrapping more than two layers.
6. The flexible fire-resistant cable according to claim 4, wherein: and all the convex ribs (9) distributed on the periphery of the insulating material extruding layer (3) are molded along the length direction of the insulating material extruding layer (3).
7. A flexible fire-resistant cable according to claim 1 or 2, characterized in that: the cable core of the fireproof cable is of a stranded structure with a plurality of insulated conductors, each insulated conductor mainly comprises a conductor (1) and an insulating tape wrapping layer (2) and an insulating material extruding layer (3) which are sequentially wrapped outside the conductor (1), and an inner stranded gap formed by stranding the insulated conductors is filled with a flame-retardant filling layer (10), and an outer stranded groove is filled with a flexible fireproof mud packing layer (4).
8. The flexible fire-resistant cable according to claim 7, wherein: the insulating tape wrapping layer (2) is of a mica tape wrapping structure wrapping more than two layers.
9. A fire clay filler for a flexible fireproof cable according to claim 1, wherein the fire clay filler is prepared from the following raw materials in parts by weight:
55-65 parts of magnesium hydroxide,
30-40 parts of sodium silicate,
1-10 parts of methyl silicone oil,
1-10 parts of lignocellulose.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112700920A (en) * | 2020-12-16 | 2021-04-23 | 刘金桥 | Self-adaptive rigid-flexible dual-state fireproof cable |
| CN113593757A (en) * | 2021-08-25 | 2021-11-02 | 金杯电工衡阳电缆有限公司 | Novel flexible mineral insulated cable |
| CN114349461A (en) * | 2021-12-23 | 2022-04-15 | 特变电工(德阳)电缆股份有限公司 | Low-thermal-conductivity-coefficient fireproof mud, preparation method thereof and medium-voltage fireproof cable |
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2020
- 2020-09-28 CN CN202011041663.XA patent/CN112071492A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112700920A (en) * | 2020-12-16 | 2021-04-23 | 刘金桥 | Self-adaptive rigid-flexible dual-state fireproof cable |
| CN112700920B (en) * | 2020-12-16 | 2022-02-22 | 新疆胡杨线缆制造有限公司 | Self-adaptive rigid-flexible dual-state fireproof cable |
| CN113593757A (en) * | 2021-08-25 | 2021-11-02 | 金杯电工衡阳电缆有限公司 | Novel flexible mineral insulated cable |
| CN114349461A (en) * | 2021-12-23 | 2022-04-15 | 特变电工(德阳)电缆股份有限公司 | Low-thermal-conductivity-coefficient fireproof mud, preparation method thereof and medium-voltage fireproof cable |
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